My 3 year old son is up at least 3 to 4 nights out of the week late. he is up at 730am, he take a 1 hour nap in the afternoon. but when it is time for bed, he sleeps for a while and then around 2 0r 3 in morning he wakes up just laughing and humming. I mean laughing like he does when you tickle him. like an uncontrollable laughter. we thought he was autistic but has been tested and he is fine. He will sit up in his bed and laugh for hours. one day last week he was up for 22 hours straight! he will hum songs and just giggle. I think it is more disturbing for my husband and I because we get NO sleep. I have tried benedryl, but that has the opposite affect on him. he becomes HYPER instead of sleepy. Doctor says it is not a good idea to medicate such a young child on sleeping meds. I NEED SUGGESTIONS!!!